Initial commit

1 files changed, 42 insertions, 0 deletions

diff --git a/display_driver/display_driver.ino b/display_driver/display_driver.ino
new file mode 100644
index 0000000..dd95d18
--- /dev/null
+++ b/display_driver/display_driver.ino
@@ -0,0 +1,42 @@
+const uint8_t sipo_strobe_pin = 6;
+
+const uint8_t sipo_data_pin = 7;
+
+const uint8_t sipo_clock_pin = 8;
+
+void setup() {
+  Serial.begin(9600);
+
+  pinMode(sipo_strobe_pin, OUTPUT);
+  pinMode(sipo_data_pin, OUTPUT);
+  pinMode(sipo_clock_pin, OUTPUT);
+}
+
+void loop() {
+  for (int i = 0; i < 9999; ++i) {
+    showNumber(i);
+    delay(1000);
+  }
+}
+
+void showNumber(int value) {
+  if (value > 9999) {
+    Serial.println("warning: truncating value");
+    value = 9999;
+  }
+
+  for (int i = 3; i >= 0; --i) {
+    uint8_t digit = value % 10;
+    value /= 10;
+
+    const uint8_t ALL_LATCHED = 0xF0;
+    shiftToSipo(ALL_LATCHED - (16 << i) + digit);
+    shiftToSipo(ALL_LATCHED + digit);
+  }
+}
+
+void shiftToSipo(uint8_t bits) {
+  digitalWrite(sipo_strobe_pin, LOW);
+  shiftOut(sipo_data_pin, sipo_clock_pin, MSBFIRST, bits);
+  digitalWrite(sipo_strobe_pin, HIGH);  
+}
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